Nuclear families: The nuclear family consists of two generations, parents and children. The adults are responsible for the children who are theirs or adopted.
Extended families: An extended family contains kin beyond the nuclear family. This could be through vertical extensions with additional family members from a third generation, such as grandparents, or through horizontal extensions with e.g. a wife's sister.
Households: A household is a dwelling where one or more persons live.
Family size: The average family size in the UK has decreased during the…